一、修改硬盘大小
关闭虚拟机→设置→硬盘→修改到自己需要的磁盘大小
二、查看根目录当前磁盘使用情况统计
df -h
从左到右每一列分别代表： 文件系统的名称、 总磁盘空间大小、 已使用空间大小、 可用空间大小、 使用的磁盘空间百分比、 "安装在"指定的文件系统的挂载点
虽然在第1步已经设置过新的磁盘大小为50G，但是这里明显可以看出总磁盘大小依旧是之前的20G，这就涉及到分区问题。
三、（非必要步骤）清理缓存文件
查看各文件夹内存占用情况
du -h /home(目标文件夹)
通常/home/xxx/.cache/vmware中会有很多缓存文件
以drag_and_drop文件夹为例，清除其中所有缓存文件
cd /home/xxx/.cache/vmware/drag_and_drop
rm -rf *
四、修改分区，将磁盘空间分配给根目录
1、查看磁盘分区表
可以看到主机真实的磁盘大小是之前设置的50G左右
fdisk -l
2、创建分区
[root@localhost wwj]# fdisk /dev/sda
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): n
Partition type:
p primary (2 primary, 0 extended, 2 free)
e extended
Select (default p): p
Partition number (3,4, default 3): 3
First sector (41943040-104857599, default 41943040):
Using default value 41943040
Last sector, +sectors or +size{K,M,G} (41943040-104857599, default 104857599):
Using default value 104857599
Partition 3 of type Linux and of size 30 GiB is set
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
3、再次查看磁盘分区表
[root@localhost wwj]# fdisk -l /dev/sda
Disk /dev/sda: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000c7cd9
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 41943039 19921920 8e Linux LVM
/dev/sda3 41943040 104857599 31457280 83 Linux ##新增
4、接收新的分区表信息
[root@localhost wwj]# partprobe
5、将分区格式化为ext4格式
[root@localhost wwj]# mkfs.ext4 /dev/sda3
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
1966080 inodes, 7864320 blocks
393216 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2155872256
240 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000
Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
5、查看卷组名
[root@localhost wwj]# vgdisplay
--- Volume group ---
VG Name centos #记录下centos
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size <19.00 GiB
PE Size 4.00 MiB
Total PE 4863
Alloc PE / Size 4863 / <19.00 GiB
Free PE / Size 0 / 0
VG UUID J1Y42w-Mfbh-D2E3-x3AN-eAwj-8uXP-yGFmmx
6、创建新物理卷
[root@localhost wwj]# pvcreate /dev/sda3
WARNING: ext4 signature detected on /dev/sda3 at offset 1080. Wipe it? [y/n]: y
Wiping ext4 signature on /dev/sda3.
Physical volume "/dev/sda3" successfully created.
7、扩展到卷组
[root@localhost wwj]# vgextend centos /dev/sda3
Volume group "centos" successfully extended
8、查看根分区
[root@localhost wwj]# lvdisplay
--- Logical volume ---
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID UcMFe1-piPb-2nde-czW0-teDj-a211-l0xLz7
LV Write Access read/write
LV Creation host, time localhost, 2021-05-29 13:14:18 +0800
LV Status available
# open 2
LV Size 2.00 GiB
Current LE 512
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:1
--- Logical volume ---
LV Path /dev/centos/root #记录路径
LV Name root
VG Name centos
LV UUID xmiDBZ-lUpb-uzTf-t2SA-dJxS-zZtu-VS0eaA
LV Write Access read/write
LV Creation host, time localhost, 2021-05-29 13:14:18 +0800
LV Status available
# open 1
LV Size <17.00 GiB
Current LE 4351
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
9、扩展到容量逻辑分区
[root@localhost wwj]# lvextend /dev/centos/root /dev/sda3
Size of logical volume centos/root changed from <17.00 GiB (4351 extents) to 46.99 GiB (12030 extents).
Logical volume centos/root successfully resized.
10、刷新逻辑分区
[root@localhost wwj]# resize2fs /dev/centos/root
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open /dev/centos/root
Couldn't find valid filesystem superblock.
11、若报错，查看文件系统是不是xfs 的
[root@localhost wwj]# cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Sat May 29 13:14:18 2021
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/centos-root / xfs defaults 0 0
UUID=4a67fcc6-9d2e-4ddd-a92f-6afe811dd66e /boot xfs defaults 0 0
/dev/mapper/centos-swap swap swap defaults 0 0
12、若是，则用该命令
[root@localhost wwj]# xfs_growfs /dev/centos/root
meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=1113856 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=4455424, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 4455424 to 12318720
13、查看根目录
[root@localhost wwj]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 470M 0 470M 0% /dev
tmpfs 487M 0 487M 0% /dev/shm
tmpfs 487M 8.6M 478M 2% /run
tmpfs 487M 0 487M 0% /sys/fs/cgroup
/dev/mapper/centos-root 47G 16G 32G 33% /
/dev/sda1 1014M 155M 860M 16% /boot
tmpfs 98M 36K 98M 1% /run/user/1000
tmpfs 98M 0 98M 0% /run/user/0
这时候已经变成47G
重启虚拟机生效
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